DL 2109 then UA 5 at Houston
New York LaGuardia → Houston → London
Timetable, Houston time
21:36DL 2109 from New York LaGuardia at the gate
19:00UA 5 to London leaves the gate
21 h 24 apart on the timetable, overnight
UA 5 leaves 21 h 24 after DL 2109 arrives on the timetable: more than half a day, so not a connection we count.